user inactivity and screen blanking

[Guy Harris]

 >One way to check for idle time is by 'stat'ing the tty entry in the "/dev"
 >directory.  I think that this is how "finger" arrives at user idle times.
 >Unfortunately, the access times for "/dev/mouse" and "/dev/kbd" don't seem
 >to get updated.

Eh?  They sure get updated in 4.x (I remember having to monkey with the
way the mouse device was implemented during 4.0 development in order to
make "finger" and company give the right results).